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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6829afbdff38b88c08ef30a40ecd9de5501d8c1cfe2b57f51dc310548bfb44b' 
  AND token = 'w1/Ncb0G4zYeSqo5fFPetKGDxL+eXT9z3s9pnLtBJEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}